/Engine/Source/Developer/AssetTools/Public/AssetTypeActions_Base.h
Creates a unique package and asset name taking the form InBasePackageName+InSuffix
virtual void CreateUniqueAssetName ( const [FString](API\Runtime\Core\Containers\FString) & InBasePackageName, const [FString](API\Runtime\Core\Containers\FString) & InSuffix, [FString](API\Runtime\Core\Containers\FString) & OutPackageName, [FString](API\Runtime\Core\Containers\FString) & OutAssetName ) const